Back in July, McCain was at the Mayo Clinic in Phoenix for a routine check up when doctors found a blood clot in his left eye. The Republican was driving home when his doctor called and said he needed to turn around for emergency surgery to remove the clot.

It was days after the surgery when doctors told McCain he had glioblastoma, an aggressive form of brain cancer — and his prognosis wasn't bright. He explained to CBS:

Donald Trump wouldn't know compassion if he got hit on the head with it.

Laura Packard — who battles stage four Hodgkin's Lymphoma — has regularly been tweeting POTUS about health care and how the Affordable Care Act is keeping her, and millions of others with pre-existing conditions, alive.

In a letter to her friends, Duane "Dog" Chapman's longtime love penned:

"As most of you know I've spent a lifetime facing tests and challenges I didn't see coming and certainly never expected. I've been dealt my share of unexpected blows over the course of my almost fifty years but nothing as serious as the one I heard from my doctors two weeks ago when they uttered those dreaded three words, ‘You have cancer.'"

Zazu first hinted at her diagnosis on her band's song, Ain't Afraid, as the lyrics noted:

"There's a tumor growing on my body and I don't know what lays in store."

So heartbreaking.

Those Darlins announced they'd be going on hiatus in December 2015 and performed their last show as a group in March 2016. The indie rock goddess eventually opened up about her cancer battle in the Nashville Scene amid Those Darlins' hiatus.

It's said Jessi was surrounded by her friends and family at the time of her death at the Centennial Hospital in Nashville. Our thoughts are with her loved ones during this very sad time.

The 83-year-old said he received the scary news during a routine doctor's appointment, recounting:

"I go for my checkup and they say, 'Let's do a chest X-ray, and the doctor said to me, 'Something looks funny.' They said the spot looked pretty small. … I then did a CAT scan then a PET scan and then he said to me, 'You have lung cancer, but it looks very small, in the beginning stages.'"

Thankfully, the doctor caught the Larry King Now host's illness early. King underwent surgery on July 17 at Cedars-Sinai Medical Center in Los Angeles.

The surgery was successful — 20 percent of King's lung was removed — however, doctors made a point to tell the TV host that he was "lucky" to have the spot discovered at an early, manageable stage: